Endor Rebel - Cool White, Tri-Emitter, 435 Lumens @ 700mA
I like the choice of the Luxeon Star Rebel III . It is 9 watts total
but I believe the separation of the LEDs is better for dispersion
than the 10 watt. I think the Luxeons are higher quality also.
I had a question about drivers. I think you used two types of supplies.
The first one may have been capable of powering all of your LEds
Why 2 systems? Also what voltage on the power supply to the Driver with Dimmer?
1. Driver with Dimmer $15 with $40 power supply.
2. Xitanium ballast $28
I had to check the 120W-150W MH between 12k-14k color.
12 3 watt LEDs = 26 watts
According to this review, 25 3 watt LEDs = ~250 watts
After reading this
http://www.advancedaquarist.com/2006/8/review2#h4
I think the estimate is accurate.
I think the ideal design would be
2 Driver with Dimmer $15 ea so you could dim blue and white Leds separately
Separate components for drivers may be less expensive
adding dimming, heat sinks ... the cost increases quickly.
A future challenge is for ~ $35 or $20 you can add a microcontroller
to create sunrise,sunset and moon cycles.
http://www.makershed.com/SearchResults.asp?Cat=43